4.4 Article

Reduced graphene oxide functionalized with Cu nanoparticles: Fabrication, structure, and sensing properties

Journal

THIN SOLID FILMS
Volume 588, Issue -, Pages 11-18

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2015.03.078

Keywords

Copper; Reduced graphene oxide; Sensors; Transmission electron microscopy; Raman spectroscopy

Funding

  1. Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2011-0009946]
  2. National Research Foundation of Korea [2011-0009946] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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We have fabricated the NO2 gas sensors by using reduced graphene oxide (RGO) functionalized with copper (Cu) nanoparticles, revealing that the sensitivity was significantly enhanced by the Cu functionalization. Transmission electron microscopy indicated that the nanoparticles with a cubic Cu phase were attached on the surface of RGO. Raman spectra revealed that the structural disorder of RGO was increased by the Cu-functionalization. We performed the NO2 gas sensing test, revealing that the sensor response of RGOs was increased by 326% by means of the Cu-functionalization. We have discussed the associated mechanisms. In addition, we have ascribed the functionalization-induced changes of response and recovery times to the increase of low-energy binding sites. (C) 2015 Elsevier B.V. All rights reserved.

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